Recent status of polarized parton distributions

Abstract

We study an influence of precise data on uncertainty of polarized parton distribution functions. This analysis includes the SLAC-E155 proton target data which are precise measurements. Polarized PDF uncertainties are estimated by using the Hessian matrix. We examine correlation effect between the antiquark and gluon uncertainties. It suggests that reducing the gluon uncertainty is needed to determine the polarized antiquark distribution clearly.

Comments: 5 pages, 4 figures, aipproc.cls, aipxfm.sty, fix2col.sty, aip-arlo.clo, aip-6s.clo, aip-8d.clo, aip-8s.clo. Talk given at SPIN 2002, Brookhaven National Laboratory, September 9-13, 2002, To appear in the Proceedings